Mining-machine



(No Model.) 6 SheetsSheet 3.

G. 0. PALMER.

MINING MACHINE.

No. 594,897. Patented Dec. 7,1897.

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6 SheetsSheet 4.

Patented Dec. 7, 1897.

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(No Model.) 6 sheets-sheets. O. O. PALMER.

MINING MAGHINE.

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(No Model.) 6 Sheds-Sheet 6.

G. 0. PALMER. MINING MACHINE.

No. 594,897. I Patented Dec. 7, 1897.

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UNITED STATES PATENT Erica.

CHARLES OTIS FALMER, OF CLEVELAND, OHIO.

MINING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 594,897, dated December'7, 1897.

Application as AprillB, 1894.. Serial a. 508,022. (No model.)

To all whom it may concern:

Be it known that 1, CHARLES OTIS PALMER, a citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented certain new and useful Improvements in Mining-Machines, ofwhich the following is a specification, reference being had to theaccompanying drawings.

Although many of my improvements are applicable to other classes ofexcavating-machines, yet my invention relates more especially toimprovements in that class of miningmachines in which the cuttingapparatus is carried by a swinging arm journaled in the turret of themining-machine frame and is in the nature of an improvement on theminingmachine described in my patent No. 472,177, dated April 5, 1892.

Among other things these improvements consist in the skeleton form offrame employed, which secures the requisite strength with a minimumweight; in the elastic support under the forward end of theminingmachine, which allows of a greater range of irregularity of thefloor without interfering with the working of the machine and at thesame time secures a more true and .uniform floor-surface in theconstruction of the track to more effectually resist the thrust of thecutters when in operation; in the arrangement for grooving the floor,giving a firm brace for the track and securing a uniform paralleladvance cutting movement of the mining-machine; in the swinging movementof said router, which allows it to be turned upward clear of the floorto prevent injury during the placingand loading and unloading of themachine, as well as during its transportation; in the means of feedingthe machine when making the straightcut; in the means of feeding themachine to make therotary cut; in improved means for communicating powerto the cutter-wheel; in improved means for holding the machine whileinspecting, removing, and inserting the cutter-chisels; in variousdetails connected with the inserted chisels employed for cutting thecoal and in the means for securingt-hem in place; in means for automatically removing the slack formed by the cutter-wheelyin the improvedform of constructing the cutter-carrier to cheapen the cost ofmanufacture and facilitate repairs,

and in the combination and arrangement of parts intended to simplify andstrengthen the mining-machine and to better adapt it for its intendedpurpose, as will be hereinafter explained, and pointed out in theclaims.

In the drawings forming part of this specification, Figure 1 is a planof the machine embodying my present improvements. Fig. 2 is an end viewof the machine shown in Fig. 1. Fig. 3 is a section on line G H of Fig.2. Fig. 4 is a longitudinal section with the cutter-wheel swung underthe frame. Fig. 5 is a view of the right sideof the machine with thecutter-wheel in the position shown in Fig. 1. Fig.6isahorizontalsectionapproximately in line S Tin Fig. 5. Fig. 7 is asection in line I J, Fig. 6. Fig. 8 is a detailed view of the clutch gin the worm-wheel and is similar to the clutch t in the worm-wheel 6Fig. 9 is a diagram showing a top view of the machine when nearing theend of its straight cut. Fig. 10 is a top and a side view in projectionof the track shoe-clips Fig. 11 is a plan of a mine-room, illustratingthe mode of operating the machine. Fig. 12 is a detailed plan and edgeview of part of the left rail of the track for operating themining-machine. Fig-13 is a detailed plan and edge View of part of theright rail. Fig. 14 is a transverse section of the track. Fig. 15represents two views in projection of the Wrench for adjusting theturret-feet. Fig. 16 represents two views in projection of the crank-.handle for operating the cross-feed shaft K,

feed-drum shaft t, and rotary-feed shaft g by hand. Fig. 17 is a topView of the cutter- Wheel with part broken way to show the groove forthe escape of the slack on the under side of the rim. Fig. 18 is an edgeView of the cutter-wheel shown in Fig. 17, so that the bottom side isup. Fig. 19 i'sa section of the cutter-wheel on line K L of Fig. 17.Fig. 20 is an edge view of the cutter-wheel as in the ordinary position,with the top side up. Fig. 21 is an enlarged section through thecutter-wheel pinion just below the housing and above the cutter-wheel.Fig. '22 is a vertical section on line Q R of Fig. 21. Fig. 23 is avertical section on line M N of Fig. 17 showing the inclination of themiddle cutterchisels. Fig. 24 is a vertical section on line 0 P ofFig-17, showing the inclination of the ICO outside cutter-chisels. Fig.is a detail in projection of the side and edge views of thecutter-chisels. Fig. 26 is a detail in projection of the top, side, andedge views of a middle chisel-wedge. Fig. 27 is a detail in projectionof the side, edge, and bottom of an outside chisel-wedge. Fig. 28illustrates a modified form of my cutting device. Fig. 29 is a modifiedform of my elastic support. Fig. 30 is a side view of a modified form ofmy router. Fig. 31 is a vertical longitudinal section of the routershown in Fig. 30. Fig. 32 is a plan end view of an outside cutterwedgein place.

The frame of my improved mining-machine consists of two sides 0 0,attached at their diverging ends to the track-shoes 0 0 which aresecured to the extremities of the crossbrace 0'. Between the convergingends of the sides 0 c is held the turret-ring c by having its side barsa 0 attached to the said machineframe sides. Extending across the middleof the machine-frame and joining the extremities of the turret side bars0 0 is the middle brace 0 which is strengthened bycross-braces 0extending to the turret-ring c and between said cross-braces is held aboss, into which the center stud c is inserted with a driving fit.Journaled on the center stud c is the beveled stud-gear cl, on whoseelongated shank are keyed the driving-pinion d and the driving-pulleycl. The upper end of center stud d is tapped to receive the screweye (1which passes through and holds the washer (Z in place. The screw-eye dis used in raising the machine for inspecting, adjusting, or removingthe cutter-chisels e Bolted to theupper side of the cutter-carrier e andjournaled in the turret-ring c is the turret-worm wheel 6', which alsoacts as a journal for the cutter-carrier e. An opening is made throughthe web of said turretring and flanges formed on the outside of saidring on the top and bottom sides of said opening; also, vertical ribsare formed at the ends of said opening connecting said flanges togetherand to the web of the turret-ring. The said flanges and webs form ahousing for the turret-worm. The outer side of said housing is alsoinclosed to protect the worm and further increase the strength of theturret-ring. By this construction the turret-ring is reinforced at whatwould otherwise be the weakest point by the top and bottom flanges, thatadd greatly to its strength. Besides, the vertical ribs serve as bracesto take the end thrust of the worm. Engaging with said Worm-wheel e isthe turret-worm a by which it is driven. The said cutter-carrier journalis prevented from end motion in the turret-ring c by its own flange onits upper side and by the cutter-arm e, which forms the lower flange.Secured to the under side of the opposite end of the cutter-carrier e bythe screws (2 is the platebearing 6', on which revolves the cutterwheel6.

There are some very important advantages secured by having theworm-wheel within the turret-ring. It occupies less room vertically thanwould be the case if the worm-wheel was placed on the flange at the endof the bearin g and thereby reduces the height of the machine. Theapplication of the rotating force between the ends of the bearing bringsless strain on the frame than would otherwise be the case. Thewormgearing being entirely covered by the bearing protects it from thecoal-dust as well as injury by contact while being transported.

The cutter-carrier has heretofore been cast in one piece with itsjournal, making thereby quite a heavy piece, and one that requiredunusually large and expensive tools to do the turning and gear-cuttingon the same. My cutter-carrier journal being made in a separate pieceand bolted on the carrier allows the turning and gear-cutting to be doneon much smaller and less expensive tools, while the facing on the arm 0is done on a planer of ordinary size.

My improved cutter consists, in a general way, of a large thincutter-wheel c, with gearteeth 6 on its periphery and having a hub andspokes about half the thickness of the rim. Aport-ion of the gear-teethare mortised to admit an inserted chisel 6 that projects beyond itsperiphery to operate on the coal. Said chisels e are straight pieces ofsteel of uniform section file-cut or roughened on one side and suitablytempered.

My cutter-chisels being of uniform section are cheaply manufactured, andthey have the advantage insharpening that they only need grinding on theend and do not require forgin g. The chisels when new and long are usedfor outside cutters, where the long shank helps to secure the chiselagainst sidewise displacement; but after being worn down shorter byrepeated sharpening they answer for middle cutters, where they arecompletely surrounded in the mortise to within a short distance of theend and there is little tendency for sidewise displacement.

As heretofore made the cutter-wheel spokes have been radial, and astheir motion was at right angles to the radial spokes the slack on thebottom of the kerf was simply scraped round and round with the wheel,obstructing its progress, clogging its movement, and uselessly consumingpower.

The arms at of my cutter-wheel, as herein shown, incline from the hubbackward toward the rim in the direction opposite to the direction ofmotion when in use. As material moved with a slanting scraper graduallyslides off the receding end of the scraper, so the slack made by thecutters is scraped toward the rim of the wheel. The gear-teeth are soarranged that a tooth projects from the rim of the wheel in line witheach spoke, and on the under side of the rim, preferably between thesaid tooth and the one preceding, is a groove i along which the slackscraped by the spoke escapes from the cutter-wheel.

ICC

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. kerf made by the cutter-wheel.

Removable cutters have heretofore projected from the face of thecutter-wheel and been held in position by wedges secured in place byset-screws inserted and turned from the outside of the wheel. In orderto allow the headof the set-screw to pass between the teeth ofthedriving-pinion, it necessitates a very wide tooth on the cutterwheelgear, thereby increasing the pitch of the teeth and decreasing thenumber of teeth on the driving-pinion, which is always too small atbest. This small number of teeth in gears, as is well known, greatlyincreases the friction and consequent loss of power and wear on theteeth. In my cutter-wheel the screw enters from the inside of the rim,thus allowing of a narrower cutter-wheel tooth of correspondingly lesspitch, with the consequent increase in number of pinion-teeth and theconsequent diminution of waste friction. I

In order that the mortises for the chisels may not weaken the tooth toomuch, they are made much narrower than the thickness of the rim. In thiscase it requires the combined cutting edges of four cutter-chisels eplaced side by side to equal the height of the These four cutter-chiselsconstitute a set and are arranged to follow each other successively onthe cutter-wheel. sets on a cutter-wheel, as may be determined by thehardness of the coal, the depth cut by the chisel, &c. In the presentinstance there are four sets which follow each other successively aroundthe circumference of the cutter-wheel.

The cutter-chisels e are held in position by the cutter-wedges t i whoseside next the chisel is file-cut or roughened to fit the filecut orroughened adjoining side of the cutter-chisel. Each cutter-wedge istapped longitudinally toadmit the wedge-screw 2', that enters thecutter-wheel rim from the inside and lies parallel to the cutter-chisele 011 the under side of the head of said wedgechisels which projectbeyond the plane of the cutter-wheel, as already mentioned. The outsidecutter-chisels have a cutter-wedge 2' that is dovetailed on the edgeopposite the cutter-chisel, as is shown in Figs. 27, 17, and 18. Byfile-cutting or roughening the adjacent sides of the cutter-wedge andcutter-the friction between them is increased and they are so preventedfrom slipping on each other. As long as there is no slipping betweenthem There may be one or more drive it radially into the wheelonlyserves to press the wedge tighter and hold the cutter firmer in place.Likewise with the dovetail wedge any force tending to displace anoutside cutter outward from the wheel only tends to set the wedgetighter against the cutter and .thus hold it firmer in place.

Supported in the center of the turret-worm wheel e by the radial arms dis the turrethub d, and journaled in this hub centrally of theturret-ring c is the cutter-wheel-pinion shaft (1 Keyed onto the lowerextremity of shaft 61 and engaging with the teeth of the aforesaidcutter-wheel e is the cutterwheel pinion e having the upper end of itsteeth shrouded, as shown, in the ordinary manner. On the upper end ofthe cutterwheel-pinion shaft is keyed the intermediate gear 6 thatengages with the driving-pinion 61 which is j ournaled, as aforesaid, onthe center stud 0 I Projecting from the under side of the cutter-carrieroutside the cutter-pinion are one ing-machine is carried. These elasticsupports consist each of a vertical screw g, having a large head on itslower end, which passes through and is splined in a boss g on the lowerside of the turret-arm e. The upper end of the screw 9 is screwed intothe bushing 9 which is internally threaded and is provided with a flangeon the outside lower edge. The said flanged bushing g is fitted to theinterior of the lug g on the inside of the cutter-carrier journal 6.Surrounding said flanged bushing g inside said lug g and compressedbetween said flange and the up per side of the lug is the spiralshoe-spring 9 The weight of the forward end of the machine is conveyedfrom the lugs g on the carrier-bearing, through the spring 9 andflange-bushing 9 to the supporting-screw g, which rests on the door ofthe room. Passing diametrically through the upper end of the flangedbushing g is the pin g which fits into a slot 9 in the adjusting-Wrenchg and holds it from slipping when being turned by said wrench.

When the cutter-carrier rests on a solid support, any slight rise in thefloor or foreign matter under the said supporting-foot raises thecutter-wheel proportionally, and this raising of the cutter-wheel makesa still greater rise in the floor, being formed by the cutterwheel, andthis is again repeated and enlarged in the succeeding out. A depressionin the floor under a solid supporting-footlikewise lowers thecutter-wheel correspondingly and to a greater extent, and the depressionso made in the fioor is likewise repeated and enlarged in the succeedingout. When the cutter has raised an amount equal to the clearance allowed'on the upper side between the cutter-wheel and the top of the kerf,then the wheel and possibly its carrier come in contact with the top ofthe kerf and any further rising of the cutter-wheel is liable to stallthe machine or break it. lVhen the machine rests on an elastic support,however, the support itself yields to the slight elevation under it andallows the machine to pass over the obstruction without injury toitself, and where the elevation is not too great it may pass underwithout raising the cutter-wheel and so perpetuating the elevation. Inthe same way should a depression in the floor occur the flexible supportis forced downward to the bottom of the depression without loweringperceptibly the cutter-wheel and thereby perpetuating the depression inthe out being made; The floor thereby becomes smoother with eachsucceeding out.

For raising the height of the cutter-wheel the flanged bushing is turnedby the adjusting-wrench g, which, by unscrewing the screw g from itsbushing 9 raises the turret end of the machine and so the cutter-wheelefland the mine-floor slightly inclines upward as the work progresses.Of course turning the bushing g in the opposite direction lowers thecutter-wheel and the floor slopes d ownward as the work progresses.

Running longitudinallythrough the center of the machine-frame is therouter-shaft h, which is journaled at its forward end in the bushingh,that is fastened in the middle brace c by the set-screw 7L2, as shownin Fig. 4, and its rear end is journaled in bearing 7L3, that is boltedto the cross-brace c. On the forward end of said router-shaft isfastened (with a set-screw or otherwise) the beveled gear h, whichengages with the beveled gear d, journaled on the center stud c. On therear end of the router-shaft is formed the worm hithat engages with thefriction worm-wheel 7a 011 the cross-feed shaft 70. The said worm-wheelit turns loosely on its shaft 7t between flanges k is, which are splinedto the cross-feed shaft 70, and between the frictionwheel and flanges kand k are leather friction-disks 70 The aino out of friction,andtherefore the force transmitted from the worm-wheel 7 5 to the shaftk,is regulated by the amount of pressure on the friction-disks k whichis governed by the compression of the spring 70, which in turn isregulated by the position of the collar k that is fastened to the shaft7e by a setscrew or by other well-known means.

Running longitudinally through the turretworm e is the rotary-feed shaft(1, that is journaled in the turret-bearing c at its forward end and atits rear end in the right bracebracket q, that is bolted to thecross-brace c and prevented from endwise motion by the collar g that isheld in position by screw 9 On the turret end of said shaft is splinedthe turretavorm 6 and on the track end is journaled the rotary-feedworm-wheel g having teeth of clutch g on the side thereof.

Splined to and sliding longitudinally on the rear end of the rotary-feedshaft q is the clutclrsleeve g having in its end half of the teeth ofcluth g that engage with the-correspondin g teeth in the worm-wheel gVVormwheel g is prevented from sliding into engagement with clutchs1eeveg by the shoulder on shaft q. The clutoh-sleeve Q is prevented by thecollar from slipping off the end of the shaft q and the end of shaft qis squared to fit the crank-handle 9 On the left side of themachine-fra1ne and running longitudinally therewith is the feeddrum t,which is fastened by screw 2 to feeddrum shaft 25', whose forward endhas a bearing in the middle brace c and whose rear end is j ournaled inthe left brace-bracket 15 that is bolted to the cross-brace c, as shownin Figs. 1 and O. Journaled on said drum-shaft t is the worm-wheel t,having teeth of clutch on the side thereof. Splined to and slidin glongitudinally on the outer end of the drum-shaft t is the clutch-sleeve6 having on its end teeth that engage with correspondingteeth on theworm-wheel t forming clutch i. \Vorm-wheel Z is prevented from slidinginto engagement with sleeve '6 by the shoulder on shaft '6. Sleeve i iskept on the end of the shaftt by the adjoining collar, and the end ofthe shaft is squared to fit the crankhandle The details of drum-clutch tare similar to those of clutch which is shown in Fig. 8.

Cross-feed shaft 70, before referred to, is journaled in two bearings,the journal g 011 its right end in the upper side of the rotaryfeedbracket g and the left end in bearing 0 at the top of the left shoe cKeyed on the right end of cross-feed shaft 70 outside the bearing g isthe cross-feed wormq, that engages with the worrn-wheel The worm (f iskept in place by the hexagonal head 011 the end of shaft is. Cross-feedshaft k'is prevented from longitudinal motion to the right by the collar(1 which abuts against said bearing and is held in place by a screw inthe side thereof. The thrust of the spring 71: against thefriction-flange 70 as before referred to, is transmitted from the flange70 to the sleeve 7t and to the collar g Keyed on the crossfeed shaft kand adjoining the bearing a is the drum-worm t, that engages withdrum-worm wheel i and formed 011 the end of worm i is the ratchet-wheel27, with which engages the pawl i that turns on the stud t. The pawl iis drawn in solid lines in engagement with the ratchet-wheel t and indotted lines as out of engagement.

To withstand the powerful thrust of the cutter, which sometimes movesthe ordinary tracks on the mine-floor in spite of the pres sure of thejacks, my machine is provided with means forgrooving the mine-floor. Thetrack is also provided with a downwardlyprojecting flange 1 that sets insaid groove and receives the said thrust. As the distance from the trackto the groove cutter or router is constant, each succeeding position ofthe track is made parallel to its previous one, so that as the workprogresses the room is worked out in a straight line at right angleswith the track, so that when the track is once cor rectly set the pillarof coal with straight sides and uniform thickness is maintained betweenthe rooms.

J ournaled to swing on the bushing h on one side and on thelongitudinalfeed-shaft h on the other is the router-yoke in the center of which is journaled the shank of routergear w and through whose hollow centerpasses the router w. Fastened to the end of the shank of router-gear wby the set-screw 10 is the collar 10 as shown in section in Fig. 6. Therouter 'w is here shown as atwistdrill well backed off on the sides, sothat it is adapted to cut on the side instead of the end, as ordinarilyused. A reamer or any other similar tool adapted to side cutting may beused for the purpose. The router w is held in place by the set-screw 10which is screwed through both the collar 10 and the shank of router-gearw.

A rotary motion is communicated to the router by the beveled gear 10,which is keyed on the router-shaft h and engages with the router-gear10. To the side of the middle brace c is bolted the router-screw bracket00, through whose top passes the router-screw as, having the nut 00screwed on its end and held between two projecting lugs on said bracketw. On the opposite end of the router-screw a; is an eye through whichpasses the bolt 10 on which it turns loosely and which fastens it to therouter-yoke arm 10*. To prevent injury to the router when not in use, itis swung to the horizontal or nearly horizontal position shown in Fig. 6and by the dotted lines in Fig. 7. When, however, the machine is makingthe straight out and the cutter-carrier 6 projects out from the machine,as shown in Fig. 9, then the router is brought to the perpendicularposition shown in Fig. 7 by turning the nut 50 on the router-screw 00,and

when so turned the router cuts a groove 1 in the floor of the room, intowhich sets the downward-projecting track-flange y when set for thesucceeding cut. Upon the track-rails, which are designated in a generalway by y, rests the rear end of the mining-machine, the said rail ybeing made of a Z-shaped bar y, to one flange of which is riveted theangleiron g On the end of one of the rails y is riveted the plate 1having a jack-hole in its end. The end of the abutting rail also has ajackhole 11 which registers with said hole g in said track-plate andwhen in position forms one continuous hole for the lower end of the jacky when the ends of the rails y are abutting. As the track-groove g isonly cut from the central position of the machine on the left side ofthe room. to the central position on the right side, as shown in Fig.11, so the flange 2 which sets into the groove, does not extend the fulllength of the track, but ends at the same point 3 as indicated in Fig.11. The lower end of the track-jack 1 is turned cylindrical and fitsinto these holes 11 and thus holds the rails in their proper relativeposition, while the shoulder on jack if rests on top of the rails andholds them firmly to the floor. The outer ends of the rails y y are alsoheld in position by jacks in a similar manner,-while the lowertrack-flange g sets in the. floor-groove if, made by the router duringthe previous undercutting.

For the purpose of guiding the machine on the track the shoes 0 c arefurnished with downward-projecting flanges 50 and m ,which engage thetop of the rail on either side. For

preventing the machine-frame being raised from the track each shoe has aclip 0: sliding in a groove in the top thereof. Each clip 00? has ahook-shaped end that engages under the top flange of the rail, as shownin Fig. 3, and is held in place by the screw 00", which passes through aslotted hole in the clip and is screwed'into a tapped hole in the shoe.When it is wanted to lift the machine from the track, the screw m isunscrewed and the clip is slid forward sufficient to disengage the clipfrom the flange of the track.

The power for operating the mining-machine is communicated to it from amotor by the driving-rope 7", which runs in the groove of thedriving-pulley 61 as shown in Fig. 9.

As before stated, Fig. 9 illustrates the machine when making thestraight out, the direction of rotation of the cutting-wheel beingindicated by the arrow on its right. At the right-hand end of the trackis the trackbracket z, having the bracket-pulley z attached thereto bythe yoke 2 the said bracket .2 being hooked onto theend of the track 'yby the hook 2 The hauling rope or chain 2 has one end attached to thedrum t by the screw Z5 and after passing around the bracketpulley z isattached to the bolt z in the middle brace 0 The hauling-rope .2 mightbe hitched to the end of the track; but by putting the rope around thebracket-pulley z and fastening to the machine, as here shown anddescribed, the line of draft is brought nearer the working breast and somore nearly to the center of resistance to the moving of the machine.This lessens the friction caused by the gripping action of the shoes onthe track, requiring less power for feeding and less strain onthemachine.

To operate the mining-machine in a mine worked by the room system, thetrack is placed in position with its flange g in the floor-groovepreviously cut and held by the jacks @f, as shown in- Figs. 4 and 11.The mining-machine is placed on the track at the left side of the roomnext the working breast, as shown in solid lines in Fig. 11, thecutterwheel being under the middle of the machineframe. The machine isthen secured to the track by the shoe-clip the track-bracket z hooked onthe right end of the track, the hau1ing-rope'z .11nwound from the drum25, passed around the pulley z and secured to the bolt Z6 on themachine.

Its

To facilitate the Windin g and unwinding of the rope on the drum t, theclutch is thrown out of engagement and the drum turned by thecrank-handle g which fits on the end of the drum-shaft t. Thedriving-rope r after leaving the motor-pulley passes around the idlers band b and the driving-pulley cl on the mining-machine, as shown in Fig.9. The clutch g is then engaged, and clutch t and pawl are disengaged.

The power which is conveyed by the driving-rope r to the driving-pulleyd is transmitted by gears (Z c and e to the cutterwheel a, giving it arotary motion (in the direction shown by the arrow in Fig. 1) forcutting away the coal. The power from drivingpulley d is also conveyedby gears (Z and 7L4 to the router-shaft it, that carries worm k whichengages worm-wheel it on shaft 76.

On the cross-feed shaft is are keyed worm 25 that engages worm-wheel ton the drum-shaf t t, and worm q, that engages worm-wheel g on rotaryshaft q. By engaging clutch g the rotary motion of worm-wheel g istransmitted to shaft q and to turret-worm 6 that engages the turret-wormwheel 2, and the cutter-carrier 6, being bolted thereto, is given theslow rotary motion required to feed the cutter to its work. hen thecutter-carrier has progressed to the outward position, (shown in Fig.9,) the cutting feed is stopped by throwing the pawl 75 into engagement,thus keeping the cross-feed shaft 71 from turning and compelling thefriction-wheel 75' to slide on the friction-disks k on either sidethereof. The clutch g is now thrown out of engagement, the routergradually swung to its vertical or Working position, the clutch t throwninto engagement, and the pawl 75 released. Then the straight out acrossthe room commences and continues to the dotted position shown on theright of Fig. 11. Again the pawl 15 is thrown into engagement, therouter swung to the horizontal position, clutch t disengaged, thetrack-bracket z removed, the hauling-rope a wound on the drum t, the

clutch engaged, and when pawl 23 is disengaged the rotary feed is againresumed. After cutting the upper righthand corner of the room the feedis again stopped with the cutter-wheel under the middle of the machine,as shown in dotted lines on the right in Fig. 11. The driving-rope r isnow removed from the machine, the jacks taken down, the mining-machineloaded on its truck, and the track removed to one side. The coal is thenbrought down in the usual manner.

Sulfur balls and other obstructions are sometimes encountered in thecoal, which require additional power to feed the machine and also todrive the cutter-wheel. The power employed in feeding is limited by thefriction 011 the sides of friction-wheel 7c,which is constant. Thereforewhen the demand for feed-power exceeds this limit the rate of progressis reduced or may be stopped entirely, thus preventing injury to thecutter-chisels or possibly other parts of the machine. When the operatorjudges by the laboring of the machine that an obstruction is reached, itis preferable to stop the feed by throwing the pawl i into engagementand operate the-feed by hand by means of the crank-handle which fits onthe end of the cross-feed shaft k. Should the cutter be unable to cutthrough the obstruction, it is withdrawn from the kerf by being swung tothe left, half around. The obstruction is then removed by hand and thecutting resumed as before. When the cutter e is not operating on thecoal, the cuttercarrier e may be more rapidly rotated by disengagingclutch g and turning shaft g by means of the crank-handle g which fitson the shank on its outer end.

I have shown my mining-machine as driven by a belt or rope; but it isevident that it may be driven by means similar to those of my Patent No.4E72,178 for driving mechanism, dated April 5, 1892, or my patent for amining-machine, No. 472,177, dated April 5, 1892.

Not only is the machine adapted to be driven by a motor on a separatetruck, but the motor itself may be placed on the machine-frame, a gearsubstituted for the pulley 1' on the shaft h, and a pinion on themotor-shaft made to engage said gear.

Although a rope is well adapted for trans mitting power to themining-machine from a motor placed on a separate truck, yet a verycompact arrangement may also be made by driving it by a belt on thedotted pulley r on shaft h.

lVhen it is desired to remove the cutters for sharpening, a hook or ropeis passed through the center stud -eye d and the machine is raised untilthe cutter-wheel clears the floor several inches. The cutter-wheel isthen revolved, (either by the driving-pulley d, the intermediate gear 6or the cutter-wheel 6 thus bringing the cutter-chisels on its peripherysuccessively into the position for inspection or removal for sharpening.

The pawl t and ratchet t might be dispensed with and the drum feedcontrolled by throwing the clutch 25' in and out of gear and the rotaryfeed by throwing clutch g in and out of gear; but these clutches cannotbe engaged instantly unless the notches happen to be opposite at thetime. So, also, in disengaging them the pressure between the engagingteeth is so great as to make it possibly diflicult to slide the sleeveout of engagement; but the pawl and ratchet is certain, instantaneous,and easily made.

If it is desired to move the machine on the track in the oppositedirection, as is sometimes the case when an obstacle is encountered, thehauling-rope is rigged with the track-bracket hooked on the left end ofthe track, when the winding of the haulingrope on the drum moves themachine on the track to the left.

Although I have here shown a rotary cutter composed of a cutter-wheelwith cutterchisels on its periphery, which is the kind I prefer, yetthis may be replaced by a horizontally-revolving cutter-chain supportedon the cutter-carrier and driven by a pinion on the cutter -pinionshaft. This modification is illustrated in Fig. 28 of the drawings-withsufficient clearness to render more particular description unnecessary.

In the modified form of the elastic support shown in Fig. 29 the screw 9has a steep spiral thread cut in its shank, which screws into theinternally-screW-threaded lug. Pressure on the lower end of screw grotates it and winds the spring at its upper end. The tension on saidspring is adjusted by turning the collar g on its boss, to which it issecured by one or more set-screws, as shown.

In the modified form of the routerin Figs.

30 and 31 a side-milling cutter is journaled.

' planation.

I have not in this application broadly claimed the cutter-fasteningherein shown and described, as it forms part of my copendingapplication, Serial No. 593,359, filed May 27, 1896, for cutter-chainfor mining-machines.

Having thus described my invention, I claim 1. The combination in amining-machine, of a machine-frame, a cutter-carrier projecting from theforward end thereof, a horizontally-revolving cutter supported by saidcarrier, one or more elastic feet supporting said carrier, a rigid tracksupporting the rear end of said frame, means for imparting a revolvingmotion to said cutter and sliding said frame on said track.

2. The combination in a mining-machine of a machine-frame havingtrack-shoes on the two rear corners thereof, a cutter-carrier journaledon the forward end thereof, a horizontally-revolving cutter journaled onsaid carrier, an elastic foot under said cutter-carrier, a track undersaid track shoes, and means for revolving said cutter and sliding themachine on said track substantially as set forth.

3. The combination in a mining-machine of the undercutting type, of amachine-frame, a cutter-arm supported by said frame and carrying ahorizontally-revolving cutter, a track-rail supporting the rear end ofsaid frame, a hole in the forward end of the machine, avertically-sliding plunger passing downward through said hole to thefloor of the mine, a spring-cushion interposed between the machine-frameand plunger upon which is supported its forward end, together 4'. Thecombination in a mining-machine of a machine-frame having track-shoes onits rear end, a cutter-carrier j ournaled in its for ward end, ahorizontallyrevolving cutter journaled at the extremity of saidcutter-carrier, a cutter-wheel pinion j on rnaled centrally of saidcutter-arm journal, and engaging said cutter, turret-screw g, on theunder side of said cutter-carrier, bushing g on the upper end of screwg, spring 9 compressed between said bushing g and the cutter-armjournal, a track under said track-shoes and means for revolving saidcutter-wheel pinion and moving the mining-machine on said track.

5. A mining-machine track-rail having an aperture in the end thereof, anabutting rail formed with a hole therein registering with the saidaperture,in combination with a trackjack having its lower end fittingsaid registered holes for securing said rails together and to the floor.

6. A mining-machine track consisting of a flanged beam, an angle-barhaving one limb attached to the vertical flange of said flanged beam,and the other limb projecting horizontally from said flange, a flange onsaid track projecting below the floor-surface and engagsaid registeredholes substantially as and for the purpose set forth.

8. A mining-machine track consisting of two or more abutting rails,registering holes in the ends of said rails, a track-jack engagin g saidregistering holes, a downwardly-pro jecting flange on said trackengaging with a track-groove in the floor, an L-shaped flange projectingupward from said track, a trackshoe clip engaging said: upper flange,substantially as and for the purpose set forth.

9. The combination with a mining-machine adapted to the undercutting ofcoal, of a track supporting the rear part thereof, said track formedwith a downwarddepending edge adapted to enter and be held in a groovein the floor, and a router operatively connected with the drivingmechanism of the machine and arranged to cut a groove in the floor ofthe mine parallel with the track and in adrevolving router journaled insaid yoke in operative connection with a gear on the routershaft andadapted to cut a transverse groove in the floor of the mine when thesaid arm is in its downward position and to swing upwardly to clear thesaid rotating cutter and carrying-arm when in their inner position,substantially as described.

12. In combination in a mining-machine a horizontal router-shaft andmeans for driving the same, a router-yoke journaled concentrically withsaid shaft, an arm on said router-yoke, a router-screw attached to saidarm, an adjusting-nut on said router-screw and lying between lugs on therouter-screw bracket, together with a router jonrnaled in saidrouter-yoke and driven from said routershaft, substantially as and forthe purpose set forth.

13. In a mining-machine the combination with a continuously-rotatingcutter-wheel, of a feed-drum shaft, a feed-drum fixed on said shaft, aworm-wheel on said drum-shaft, a cross-feed shaft journaled on themachine frame, a friction-gear journaled 011 said crossfeed shaft andnormally coupling the feeding-train, a worm secured to said cross-feedshaft and engaging the drum worm-wheel, a ratchet fixed on saidcross-feed shaft, a pawl engaging and disengaging said ratchet wherebywhen the pawl is in engagement with the ratchet the feed is arrested,and conversely.

14:. A 1nining-maehine frame, a cutter-carrier c projecting from theforward end thereof and carrying a horizontally-revolving cutterthereon, pinion e engaging said cutter, together with gear 6 on shaft (1pinion d gear (Z and pulley (Z journaled on stud 0", gear h and worm 7L5on shaft h, gear 7t and worm i on shaft 70, worm-wheel t and drum 25 onshaft t, track-shoes c and 0 attached to the machine-frame and engagingtrack y, all combined and operated substantially as set forth.

15. The combination in a mining-machine of the machine-frame having aturret-ring on the forward end, an opening through the web of saidturret-ring, flanges formed on the outside of said ring on the top andbottom sides of said opening, vertical ribs at the ends of said openingconnecting said flanges, a cutter-carrier having cogs 011 its peripheryj ournaled in said turret-ring and carrying a horizontally-revolvingcutter, a worm situated in the said opening and engaging said cogs, ashaft splined in said worm and having at its outer end means forattaching a crank-handle for operating the same substantially as setforth.

16. In a mining-machine, the machineframe having a turret-bearing at theforward end thereof, a cutter-carrier journaled in said bearing, shaft djournaled in said cutter-car- 'rier journal, combined with gear 6 piniond pulley d", pinion e", cutter-wheel c also gears cl and h shaft h worm7L worm -wheel 7r shaft 7t, worm q, worm-Wheel g shaft q, worm e andworm-wheel e, substantially as and for the purpose set forth.

1.7. A spur-cog cutter-whcel, the teeth of which have radially-disposedinwardly-tapering mortises therethrough, cutter-chisels seated in saidmortises,inwardlytapering and radially-tapped dovetailed cutter-wedgesfitting inwardly from the peripheral openings of said mortises andadapted to be tightened in their seats by the inward pressure upon thecutter-chisels in cutting, radial wedgescrews operated from the insideof the rim engaging said wedges and drawing the same radially inward toretain the wedges in close engagement with the cutter-chisels,substantially as described.

18. In a mining-machine, a horizontally-revolving cutter-wheelconsisting of' a hub, a rim, and receding spokes connecting said hub andrim, of grooves on the under side of said rim in line with the front ofsaid spokes, and cutters projecting from the rim of said Wheel allcombined and operating substantially as and for the purpose set forth.

19. In a mining-machine in combination, a horizontally-revolvingcutter-wheel consisting of a hub, a rim, and receding spokes connectingsaid hub and rim, and grooves on the under side of said rim in line withthe front of said spokes; cutting-chisels passing radially through thegear-teeth of the cutter-wheel and secured therein, wedge-screws passingthrough said rim and serving to secure said chisels substantially as andfor the purpose set forth.

20. In amining-machine, a revolving turret on the forward end thereof, agearwheel j ournaled in said turret, a cutter-carrier on the under sideof said gear-wheel carrying on its outer end a horizontally-revolvingcutter consisting of a cutter-wheel having receding spokes and grooveson the underside of said rim in line with the front of said spokes,cutting-ehisels on the periphery passing radially through the gear-teethof the cutter-wheel and held in place by radially-tapped cutter-wedges,wedge-screws passing radially through said rim and engaging said wedges,substantially as and forthe purpose specified.

21. In a mining-machine, a cross-feed shaft 7r, carryin g worm g on saidshaft, Worm-wheel g shaft q, worm e worm-wheel d attached to therotating arm 6 for operating the rotaryfeed motion of themining-machine, and worm i worm-wheel i shaft 16 carrying the drum t,for operating the straight feed and friction gear-wheelja, substantiallyas set forth.

22. In a mining-machine a cross-feed shaft 70, worm i thereon engagingthe drum wormwheel t and shaft 25 carrying drum tand worm g engaging therotary-feed worm-wheel g shaft q, worm e worm-wheel cl attached to therotating arm e, friction-gear 713' on said shaft, ratchet-wheel t fixedon said shaft, pawl i engaging said ratchet, substantially as and forthe purpose set forth.

23. In a mining-machine the combination of the machine-frame having aturret-ring on its forward end, a cutter-carrier journaled Within saidturret-ring and having cogs on the periphery of said journal within saidring, and a Worm engaging said cogs, substantially as described.

24. The combination in a mining-machine of the machine-frame having aturret-ring on the forward end, an opening through the Web of saidturret-ring, flanges formed on the outside of said ring on the top andbottom sides of said opening, vertical ribs at the ends of 25. In amining-machine, the combination with the machine -frame of a turret ringthereon having a worm-housing substantially as described, formed on theside thereof, a cutter-carrier arm having a. journal fitting theinterior of said turret, said journal having a Worm-gear cut into itsperiphery at its middle part and having a bearing on the interior ofsaid turret each side of said gear, and a worm situated in said housingand engaging the gear on said journal, substantially as described.

CHARLES OTIS PALMER.

